Process of arc welding



March 26, 1929. M, Z 1,707,036

PROCESS OF ARC WELDING Filed Oct. 28, 1927 IIWEI'ItOI": Michael. Zack.

51K Attorney WWMMK MICHAEL ZACK,

Appli My present invention has for its object former, f the primary part thereof and ,7 55 to provide an improved process of and dethe circuit supplying current to the transvice for-arc welding by means of at least former. two electrodes of different natures used si- In the use of my process, owingto the multaneously. reciprocal actions of the two electrodes b Benardos process is well known. Acand c, not only the heating voltage, but also 60 cording to said process an electrode made the welding voltage, particularly at the carof carbon similar to carbons of electric arc bon electrode, will be lowered and the neceslamps is used for obtaining an electric'arc, sary current strength will' be distributal the material lost by vaporization in the over the three conductors in such a way that welding operation and the material failing the phases of the circuit will be regularly 65 in the welding line being completed by the charged.

casting of a suitable molten wire (either of As the metal wire is not supplied in a cold the same metal as the piece or not), so that state, but molten by its own heat produced the wdldiug process will be identical with by the passage of current, all the known dcthe blow lamp autogenoussoldering. Such fects of Benardos process will be completc- 70 process has various objects or defects, ly avoided.

among which the main objection is that the My process not only permits of welding fed metal wire is cold, whereby a great by means of three or two-phase current, but

amount of heat will be absorbed, such heat it also equally distributes the charge unibeing supplied by the electric arc of the formly on the two or three phases respec- 75 carbon. On the other hand the arc extendtively. Moreover, owing to the lowering of ing from the carbon, in order to be mainthe lighting voltage, the power factor will tained, will require a comparatively high be increased.

voltage, say about to volts on one On the other hand the general use of two hand, and on the other hand owing to the different electrodes, of which a particular great amount of heat required for melting case is a carbon electrode and a metal electhe metal wire, a large expense of current trode, has different advantages which are which will cause strong vaporization of the intimately connected with the fact that by the 30 carbon, that is prejudicial to the weldin use of a plurality of electrodes, I will bet.-

In order to avoid such defects, the inventcr realize the conditions in which the elec- 35 tion contemplates the provision of a plutric welding takes place, which after all is rality of arcs; a heating are between the merelyan electro-metallurgical process of a carbon and the working piece; a welding are special nature. In fact the use of two dit- 35 between the metal wire and the working ferent electrodes will result into the intipicce, and a supplemental are between the mate melting of two different constituents, carbon and the metal wire. so as to obtain a welding of required quali- My new process may be carried into practies. Moreover the two electrodes may be tical ell'ect in different ways either in direct selected so that the heat produced will be 0 current or in alternate single or multiphase distributed in the most advantageous way,

current. In the use of a multiphase curwhich it is not possible to obtain it a single rent (for instance three or two-phase), one electrode only is used. This latter advair of the conductors will be connected to the tage will be considerable if an electrode of working piece, another to the carbon eleccarbon and an electrode of metal is used, the trode and the third to the metal wire. first serving primarily to al -ford the heating In the accompanying drawings I have ilarc and the second the weiding are. Parlustrated diagrammatically an arrangement ticularly my process enables to effect the for carrying my improved process into efwelding of very thin metal sheets and metals feet in the most frequent practical case. other than iron, the heating of the working 50 Referring to the drawings a is the workpiece (sheet or the like) being adjustable in; piece, 1) the metal electrode, 0 the carbon independently from the fusion of the metal electrode. (Z the choking or reactance coils to be introduced. inserted behind the conductors of the weld- It will be obvious that the invention is not ing circuit, 0 the secondary part of a transall limited to the use of a metal electrode and a carbon electrode, but it may also be applied to the use of two different electrodes made of otlierwlnaterialsm Having now, fully/described, my: said iiivention, what- I claim and desire to secure lay Letters Patent, is:

my hand? and-between theaalectfiof esf themsdyes on the 15 other hand, and making said electrodes of carbon and metal respectively, substantially The improvell-pmeess-of electric are-Weld "(is Set-fowl]; ing with direct. or alternate currents, which consists,- in using simultaneously two ewe trodes at. least, arranging said electrodes with relation to each other and to the Work- A Intestimgny whereof I have hereunto set MICHAEL ZACK. 

